diff --git a/ed/idlpatches/periodic-background-sync.idl.patch b/ed/idlpatches/periodic-background-sync.idl.patch
index bf0de837a4d1..ba360bf6e875 100644
--- a/ed/idlpatches/periodic-background-sync.idl.patch
+++ b/ed/idlpatches/periodic-background-sync.idl.patch
@@ -1,41 +1,26 @@
-From 041ef37f11822170a3a106d0d9935d2c87e61381 Mon Sep 17 00:00:00 2001
+From 11a5903c3c2e6517d75f5678915c6973de3cd257 Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Philip=20J=C3=A4genstedt?= <philip@foolip.org>
 Date: Tue, 16 Feb 2021 14:27:26 +0100
 Subject: [PATCH] Fix periodic-background-sync.idl
 
-https://github.com/WICG/periodic-background-sync/pull/4
-https://github.com/WICG/periodic-background-sync/pull/5
+https://github.com/WICG/periodic-background-sync/pull/10
 ---
- ed/idl/periodic-background-sync.idl | 11 +++++------
- 1 file changed, 5 insertions(+), 6 deletions(-)
+ ed/idl/periodic-background-sync.idl | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/ed/idl/periodic-background-sync.idl b/ed/idl/periodic-background-sync.idl
-index 37a58ba14..b87475304 100644
+index b039afc5a..d61ebe9b8 100644
 --- a/ed/idl/periodic-background-sync.idl
 +++ b/ed/idl/periodic-background-sync.idl
 @@ -14,7 +14,7 @@ partial interface ServiceWorkerRegistration {
  
  [Exposed=(Window,Worker)]
  interface PeriodicSyncManager {
--    Promise<void> register(DOMString tag, optional BackgroundSyncOptions options);
-+    Promise<void> register(DOMString tag, optional BackgroundSyncOptions options = {});
+-    Promise<undefined> register(DOMString tag, optional BackgroundSyncOptions options);
++    Promise<undefined> register(DOMString tag, optional BackgroundSyncOptions options = {});
      Promise<sequence<DOMString>> getTags();
-     Promise<void> unregister(DOMString tag);
+     Promise<undefined> unregister(DOMString tag);
  };
-@@ -27,9 +27,8 @@ dictionary PeriodicSyncEventInit : ExtendableEventInit {
-     required DOMString tag;
- };
- 
--[
--    Constructor(DOMString type, PeriodicSyncEventInit init),
--    Exposed=ServiceWorker
--] interface PeriodicSyncEvent : ExtendableEvent {
-+[Exposed=ServiceWorker]
-+interface PeriodicSyncEvent : ExtendableEvent {
-+    constructor(DOMString type, PeriodicSyncEventInit init);
-     readonly attribute DOMString tag;
--  };
-+};
 -- 
-2.30.0.365.g02bc693789-goog
+2.31.1.295.g9ea45b61b8-goog